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CN103119696A - Film manufacturing method and film manufacturing apparatus - Google Patents

Film manufacturing method and film manufacturing apparatus
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CN103119696A
CN103119696ACN2011800450686ACN201180045068ACN103119696ACN 103119696 ACN103119696 ACN 103119696ACN 2011800450686 ACN2011800450686 ACN 2011800450686ACN 201180045068 ACN201180045068 ACN 201180045068ACN 103119696 ACN103119696 ACN 103119696A
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gas
supply
chamber
thin film
substrate
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增田健
梶沼雅彦
出野琢也
小田岛畅洋
内田阳平
邹弘纲
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Ulvac Inc
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Ulvac Inc
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Abstract

The invention provides a thin film manufacturing method and a thin film manufacturing apparatus capable of manufacturing a dielectric thin film with small surface roughness. The film manufacturing method according to the present invention includes: supplying a mixed gas to a heated substrate S in a chamber (51), the mixed gas including a metal raw material gas that is a raw material of a dielectric thin film having a perovskite-type crystal and an oxidizing gas that reacts with the metal raw material gas; stopping supplying the metal source gas to the substrate S; after the supply of the metal source gas is stopped, the supply of the oxidizing gas to the substrate S is restricted.

Description

Translated fromChinese
薄膜制造方法和薄膜制造装置Film manufacturing method and film manufacturing apparatus

技术领域technical field

本发明涉及用于制造电介质薄膜,例如PZT(锆钛酸铅)薄膜等的薄膜制造方法以及薄膜制造装置。The present invention relates to a thin film manufacturing method and a thin film manufacturing apparatus for manufacturing a dielectric thin film, such as a PZT (lead zirconate titanate) thin film.

背景技术Background technique

以往,作为用于铁电体存储器(Ferroelectric Random Access Memory,FeRAM)等的铁电体薄膜,具有钙钛矿结构的锆钛酸铅(Pb(Zr,Ti)03,PZT)等的薄膜被广泛熟知。这种电介质薄膜,例如通过有机金属化学气相沉积(MetalOrganic Chemical Vapor Deposition,MOCVD)法制造。Conventionally, thin films of lead zirconate titanate (Pb(Zr,Ti)03 , PZT) having a perovskite structure have been used as ferroelectric thin films for ferroelectric random access memory (FeRAM) and the like. Widely known. Such a dielectric thin film is produced, for example, by MetalOrganic Chemical Vapor Deposition (MOCVD) method.

MOCVD法是通过使有机金属原料气体和氧化气体在高温中反应,制造电介质薄膜的方法。为了制造高品质的电介质薄膜,利用即使改变原料气体的流量,薄膜的组成比例几乎也不发生变化的自对准区域。The MOCVD method is a method of producing a dielectric thin film by reacting an organic metal raw material gas and an oxidizing gas at high temperature. In order to manufacture a high-quality dielectric thin film, a self-aligned region in which the composition ratio of the thin film hardly changes even if the flow rate of the source gas is changed is used.

专利文献1中记载了一种将有机金属原料气体、氧化气体以及稀释气体的混合气体供给到加热的基板上的MOCVD法。专利文献1所记载的MOCVD法中,将混合气体供给到基板时,同时供给高燃烧性的燃烧性气体。因此,在成膜过程中,基板表面的过量的氧燃烧排除,所以能够制造高品质的薄膜(参照专利文献1的段落[0011]、[0025]等)。Patent Document 1 describes an MOCVD method in which a mixed gas of an organometallic source gas, an oxidizing gas, and a diluent gas is supplied onto a heated substrate. In the MOCVD method described inPatent Document 1, when the mixed gas is supplied to the substrate, a highly combustible combustible gas is simultaneously supplied. Therefore, excess oxygen on the surface of the substrate is combusted and eliminated during film formation, so that a high-quality thin film can be produced (see paragraphs [0011], [0025], etc. of Patent Document 1).

专利文献1:特开2004-273787号公报Patent Document 1: JP-A-2004-273787

在上述电介质薄膜的制造中,期望所制造的电介质薄膜的表面粗糙度小。电介质薄膜的表面粗糙度大,则可能会在例如制造具有电介质薄膜的铁电体存储器时的制造过程中产生问题。另外,也担心例如电介质薄膜的电气特性不能充分发挥。In the production of the above-mentioned dielectric thin film, it is desirable that the surface roughness of the produced dielectric thin film is small. A large surface roughness of the dielectric thin film may cause problems in the manufacturing process, for example, when manufacturing a ferroelectric memory having the dielectric thin film. In addition, there is also a concern that, for example, the electrical characteristics of the dielectric thin film cannot be fully exhibited.

发明内容Contents of the invention

有鉴于此,本发明的目的是提供能够制造表面粗糙度小的电介质薄膜的薄膜制造方法以及薄膜制造装置。In view of this, an object of the present invention is to provide a thin film manufacturing method and a thin film manufacturing apparatus capable of manufacturing a dielectric thin film with a small surface roughness.

为了达到上述目的,本发明的一实施方式所涉及的薄膜制造方法包括:将混合气体供给到腔室内的加热的基板,所述混合气体包括作为具有钙钛矿型结晶的电介质薄膜的原料的金属原料气体和与所述金属原料气体反应的氧化气体;In order to achieve the above object, a thin film manufacturing method according to an embodiment of the present invention includes supplying a mixed gas including a metal as a raw material of a dielectric thin film having a perovskite crystal to a heated substrate in a chamber. a feedstock gas and an oxidizing gas that reacts with said metal feedstock gas;

停止向所述基板供给所述金属原料气体;stopping supply of the metal feedstock gas to the substrate;

所述金属原料气体的供给停止后,限制向所述基板供给所述氧化气体。After the supply of the metal raw material gas is stopped, the supply of the oxidizing gas to the substrate is restricted.

本发明的一实施方式所涉及的薄膜制造装置包括:腔室、供给机构、气体供给控制部。A thin film manufacturing apparatus according to an embodiment of the present invention includes a chamber, a supply mechanism, and a gas supply control unit.

所述腔室中,配置有加热的基板。In the chamber, a heated substrate is arranged.

所述供给机构,用于将混合气体供给到所述腔室内的所述加热的基板,所述混合气体包括作为具有钙钛矿型结晶的电介质薄膜的原料的金属原料气体和与所述金属原料气体反应的氧化气体。The supply mechanism is for supplying a mixed gas including a metal raw material gas as a raw material of a dielectric thin film having a perovskite type crystal and the metal raw material to the heated substrate in the chamber. Oxidizing gas for gas reactions.

所述气体供给控制部,停止向所述基板供给所述金属原料气体,之后限制向所述基板供给所述氧化气体。The gas supply control unit stops supply of the metal raw material gas to the substrate, and then restricts supply of the oxidizing gas to the substrate.

附图说明Description of drawings

图1是表示本发明一实施方式所涉及的薄膜制造装置的结构例的示意图;FIG. 1 is a schematic diagram showing a structural example of a thin film manufacturing apparatus according to an embodiment of the present invention;

图2是表示具有图1所示薄膜制造装置的多室型成膜装置的结构例的示意图;FIG. 2 is a schematic diagram showing a structural example of a multi-chamber film forming apparatus having the thin film manufacturing apparatus shown in FIG. 1;

图3是相对于供给给基板的Pb原料气体的流量比,表示制造的PZT薄膜中的Pb组成比例以及Zr组成比例的曲线图;3 is a graph showing the composition ratio of Pb and the composition ratio of Zr in the produced PZT thin film with respect to the flow rate ratio of the Pb source gas supplied to the substrate;

图4是表示图1所示的薄膜制造装置所制造的PZT薄膜和比较例所涉及的制造方法所制造的PZT薄膜的各表面层的相片,以及表面层所涉及的各测量值的示意图;Fig. 4 is the photograph that represents each surface layer of the PZT thin film manufactured by the thin film manufacturing apparatus shown in Fig. 1 and the manufacturing method involved in the comparative example, and the schematic diagram of each measured value involved in the surface layer;

图5是表示图1所示的薄膜制造装置的变形例的示意图。FIG. 5 is a schematic diagram showing a modified example of the thin film manufacturing apparatus shown in FIG. 1 .

具体实施方式Detailed ways

本发明的一实施方式所涉及的薄膜制造方法包括:将混合气体供给到腔室内的加热的基板,所述混合气体包括作为具有钙钛矿型结晶的电介质薄膜的原料的金属原料气体和与所述金属原料气体反应的氧化气体;A thin film manufacturing method according to an embodiment of the present invention includes: supplying a mixed gas including a metal raw material gas as a raw material of a dielectric thin film having a perovskite crystal and the mixed gas to the heated substrate in the chamber. The oxidizing gas reacted with the metal raw material gas;

停止向所述基板供给所述金属原料气体;stopping supply of the metal feedstock gas to the substrate;

所述金属原料气体的供给停止后,限制向所述基板供给所述氧化气体。After the supply of the metal raw material gas is stopped, the supply of the oxidizing gas to the substrate is restricted.

本薄膜制造方法中,停止向基板供给金属原料气体后,能够对没有构成钙钛矿型结晶的剩余的原子与氧化气体的反应进行抑制。因此,剩余的原子不会以例如氧化物引入到电介质薄膜的表面层,能够制造出表面粗糙度小的电介质薄膜。In this thin film manufacturing method, after the supply of the metal raw material gas to the substrate is stopped, the reaction of the remaining atoms not constituting the perovskite-type crystals with the oxidizing gas can be suppressed. Therefore, the remaining atoms are not introduced into the surface layer of the dielectric thin film as, for example, an oxide, and a dielectric thin film with a small surface roughness can be produced.

所述限制工序,可以停止或减少所述氧化气体的供给。这种情况下,所述薄膜制造方法进一步可以根据所述氧化气体供给的停止或减少,将惰性气体供给到所述腔室内。In the restricting step, the supply of the oxidizing gas may be stopped or reduced. In this case, the thin film manufacturing method may further supply an inert gas into the chamber according to the stop or decrease of the supply of the oxidizing gas.

本薄膜制造方法中,根据氧化气体供给的停止或减少,将惰性气体供给到腔室内。例如,利用该惰性气体能够进行腔室内的压力调节等。因此,在多个基板上按顺序形成电介质薄膜的情况下,能够有效地促进成膜过程。In this thin film manufacturing method, an inert gas is supplied into the chamber according to the stop or reduction of the supply of the oxidizing gas. For example, pressure adjustment in the chamber and the like can be performed using the inert gas. Therefore, in the case where dielectric thin films are sequentially formed on a plurality of substrates, the film formation process can be effectively accelerated.

供给所述混合气体的工序,可以供给包含惰性气体的所述混合气体。这种情况下,根据所述氧化气体供给的停止或减少供给惰性气体的工序,可以供给包含在所述混合气体中的所述惰性气体。In the step of supplying the mixed gas, the mixed gas containing an inert gas may be supplied. In this case, the inert gas contained in the mixed gas may be supplied by stopping the supply of the oxidizing gas or reducing the supply of the inert gas.

本薄膜制造方法中,用于制造电介质薄膜的混合气体中包含惰性气体。该惰性气体,根据氧化气体供给以及停止供给到腔室内。因此,不需要用于供给惰性气体的新机构,能够容易地供给惰性气体。In this thin film manufacturing method, an inert gas is contained in the mixed gas used for manufacturing the dielectric thin film. The inert gas is supplied into the chamber according to supply and stop of the oxidizing gas. Therefore, the inert gas can be easily supplied without requiring a new mechanism for supplying the inert gas.

供给所述混合气体的工序可以通过连接混合所述金属原料气体、所述氧化气体以及所述惰性气体的混合器与所述腔室的供给流路,供给所述混合气体。这种情况下,供给所述惰性气体的工序可以通过所述混合气体通过的所述供给流路,供给所述惰性气体。In the step of supplying the mixed gas, the mixed gas may be supplied by connecting a mixer for mixing the metal raw material gas, the oxidizing gas, and the inert gas to a supply channel of the chamber. In this case, in the step of supplying the inert gas, the inert gas may be supplied through the supply channel through which the mixed gas passes.

本薄膜制造方法中,通过混合气体通过的所述供给流路,将惰性气体供给到腔室内。因此,能够防止混合气体集聚在供给流路。由此,能够稳定地在基板上形成电介质薄膜。In the thin film manufacturing method, the inert gas is supplied into the chamber through the supply channel through which the mixed gas passes. Therefore, it is possible to prevent the mixed gas from accumulating in the supply channel. Thus, the dielectric thin film can be stably formed on the substrate.

所述电介质薄膜可以是PZT(Pb(Zr,Ti)O3)。这种情况下,所述金属原料可以包含部分具有Pb(dpm)2、Pb(dibm)2,或Pb(dpm)2和Pb(dibm)2中至少一种的材料。The dielectric thin film may be PZT (Pb(Zr,Ti)O3 ). In this case, the metal raw material may partially include a material having Pb(dpm)2 , Pb(dibm)2 , or at least one of Pb(dpm)2 and Pb(dibm)2 .

所述基板可以加热到600℃以上。The substrate can be heated above 600°C.

本发明的一实施方式所涉及的薄膜制造装置包括:腔室、供给机构、气体供给控制部。A thin film manufacturing apparatus according to an embodiment of the present invention includes a chamber, a supply mechanism, and a gas supply control unit.

所述腔室中,配置有加热的基板。In the chamber, a heated substrate is disposed.

所述供给机构,用于将混合气体供给到腔室内的加热的基板,所述混合气体包括作为具有钙钛矿型结晶的电介质薄膜的原料的金属原料气体和与所述金属原料气体反应的氧化气体。The supply mechanism is for supplying a mixed gas including a metal raw material gas as a raw material of a dielectric thin film having a perovskite type crystal and an oxidizing gas reacted with the metal raw material gas to the heated substrate in the chamber. gas.

所述气体供给控制部,用于停止向所述基板供给所述金属原料气体,之后限制向所述基板供给所述氧化气体。The gas supply control unit stops supply of the metal raw material gas to the substrate, and then restricts supply of the oxidizing gas to the substrate.

以下,结合附图对本发明的实施方式进行说明。Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[薄膜制造装置][Film Manufacturing Equipment]

图1是表示本发明一实施方式所涉及的薄膜制造装置的结构例的示意图。通过本实施方式的薄膜制造装置,能够进行利用MOCVD法的铁电体PZT的薄膜制造。FIG. 1 is a schematic diagram showing a configuration example of a thin film manufacturing apparatus according to an embodiment of the present invention. With the thin film manufacturing apparatus of this embodiment, it is possible to manufacture a ferroelectric PZT thin film by MOCVD.

薄膜制造装置100具有供给有机金属的有机溶剂溶液的原料供给部10、使其溶液汽化生成原料气体的汽化器20。另外,薄膜制造装置100还具有使原料气体、与原料气体反应的氧化气体以及惰性气体混合生成混合气体的混合器30、与混合器30通过作为供给流路的供给管路33相连接的成膜室50。本实施方式中,由原料供给部10、汽化器20、混合器30、以及设置在其上的各管路及各阀门,构成供给机构。The thinfilm production apparatus 100 has a rawmaterial supply unit 10 for supplying an organic metal organic solvent solution, and avaporizer 20 for vaporizing the solution to generate a raw material gas. In addition, the thinfilm manufacturing apparatus 100 further includes amixer 30 that mixes a source gas, an oxidizing gas that reacts with the source gas, and an inert gas to generate a mixed gas, and a film-forming device that is connected to themixer 30 through a supply line 33 that is a supply line.Room 50. In this embodiment, the rawmaterial supply part 10, thevaporizer 20, themixer 30, and each pipeline and each valve provided thereon constitute a supply mechanism.

原料供给部10具有填充有机金属的原料溶液以及溶剂的罐A、B、C及D,和供给到各罐A~D的He(氦)的供给管路11。另外,原料供给部10具有用于输送由供给到各罐A~D的He的压力挤压出的金属原料溶液以及溶剂的载气的供给管路12。本实施方式中,作为载气可以使用N2(氮),但不限于此,也可以使用其他惰性气体。同样,供给到各罐A~D的气体也不限于He,也可以使用其他惰性气体。The rawmaterial supply unit 10 has tanks A, B, C, and D filled with organic metal raw material solutions and solvents, and He (helium)supply lines 11 supplied to the respective tanks A to D. In addition, the rawmaterial supply part 10 has thesupply line 12 for sending the metal raw material solution and the carrier gas of a solvent squeezed out by the pressure of He supplied to each tank A-D. In this embodiment, N2 (nitrogen) can be used as the carrier gas, but it is not limited thereto, and other inert gases can also be used. Similarly, the gas supplied to each of the tanks A to D is not limited to He, and other inert gases may be used.

本实施方式中,罐A~D中,分别填充了Pb的原料溶液,Zr的原料溶液,Ti的原料溶液,以及有机类溶剂。作为Pb、Zr以及Ti的原料溶液,使用在乙酸正丁酯溶液中,各金属原料以0.25mol/L的浓度溶解的溶液。In the present embodiment, tanks A to D are filled with a raw material solution of Pb, a raw material solution of Zr, a raw material solution of Ti, and an organic solvent, respectively. As the raw material solutions of Pb, Zr, and Ti, a solution in which each metal raw material was dissolved in a concentration of 0.25 mol/L in an n-butyl acetate solution was used.

作为Pb原料,使用Pb(dpm)2(双二新戊酰基甲烷)铅,作为Zr原料,使用Zr(dmhd)4(四(2,6)二甲基(3,5)庚二酸)锆。另外,作为Ti原料,使用Ti(iPrO)2(dpm)2((二异丙醇)(双二新戊酰基甲烷))钛。填充到罐D的溶剂使用乙酸正丁酯。需要说明的是,Pb(dpm)2也叫做Pb(thd)2(双(2,2,6,6-四甲基-3,5-庚二酸))铅。As the Pb raw material, Pb(dpm)2 (bisdipivaloylmethane)lead was used, and as the Zr raw material, Zr(dmhd)4 (tetrakis(2,6)dimethyl(3,5)pimelate) zirconium . In addition, as a Ti raw material, Ti(iPrO)2 (dpm)2 ((diisopropanol)(bisdipivaloylmethane))titanium was used. As a solvent filled in tank D, n-butyl acetate was used. In addition, Pb(dpm)2 is also called Pb(thd)2 (bis(2,2,6,6-tetramethyl-3,5-pimelic acid)) lead.

溶解在溶剂中的各金属原料,并不限于上述的原料。例如,作为Pb原料,也可以使用Pb(dibm)2(双二异丁酰基甲烷)铅等,或部分具有Pb(dpm)2以及Pb(dibm)2中的两者或者至少一种的材料。另外作为Zr原料,也可以使用Zr(thd)4(四(2,2,6,6)四甲基(3,5)庚二酸)锆等,或部分具有这些的材料。并且,作为Ti的原料,也可使用Ti(MMP)4(四(1)甲氧基(2)甲基(2)丙氧基)钛等,或部分具有这些的材料。The respective metal raw materials dissolved in the solvent are not limited to the above-mentioned raw materials. For example, as the Pb raw material, Pb(dibm)2 (bisdiisobutyrylmethane) lead or the like, or a material partially containing both or at least one of Pb(dpm)2 and Pb(dibm)2 may be used. In addition, Zr(thd)4 (tetrakis(2,2,6,6)tetramethyl(3,5)pimelate) zirconium, etc., or a material partially containing these may be used as the Zr raw material. Furthermore, Ti(MMP)4 (tetra(1)methoxy(2)methyl(2)propoxy)titanium, etc., or a material partially containing these may be used as a raw material of Ti.

溶解各金属原料的溶剂以及填充到罐D的溶剂也可以使用例如甲苯、四氢呋喃(THF)、环己烷、乙基环己烷或甲基环己烷等代替上述的乙酸正丁酯。The solvent for dissolving each metal raw material and the solvent filled in the tank D may be, for example, toluene, tetrahydrofuran (THF), cyclohexane, ethylcyclohexane, or methylcyclohexane, etc. instead of the above-mentioned n-butyl acetate.

汽化器20是通过供给管路12连接到原料供给部10,从原料供给部10向汽化器20输送金属原料溶液以及溶剂的液滴。汽化器20具有未图示的加热部,通过加热使输送的金属原料溶液以及溶剂汽化。因此,生成金属原料气体。另外,为了提高汽化效率,可以同时使用将气体或超声波等适用到金属原料溶液以及溶剂的液滴的方法,或通过细小喷嘴导入事先细微化的液滴的方法等。Thevaporizer 20 is connected to the rawmaterial supply part 10 through thesupply line 12 , and the metal raw material solution and the liquid droplets of the solvent are sent from the rawmaterial supply part 10 to thevaporizer 20 . Theevaporator 20 has a heating unit (not shown), and vaporizes the metal raw material solution and the solvent sent by heating. Accordingly, a metal raw material gas is generated. In addition, in order to increase the vaporization efficiency, a method of applying gas or ultrasonic waves to the liquid droplets of the metal raw material solution and solvent, or a method of introducing pre-miniaturized droplets through a fine nozzle, etc. may be used together.

如图1所示,汽化器20中设置了连接到混合器30的运行(Run)管路21,和连接到真空排气系统40的通风(Vent)管路22。运行管路21中设置了阀门V1,通风管路22中设置了阀门V2。As shown in FIG. 1 , a run (Run)pipeline 21 connected to amixer 30 and a ventilation (Vent)pipeline 22 connected to avacuum exhaust system 40 are provided in thecarburetor 20 . A valve V1 is set in the runningpipeline 21 , and a valve V2 is set in theventilation pipeline 22 .

混合器30是用于生成汽化器20生成的金属原料气体、氧化气体以及惰性气体的混合气体。因此,混合器30中连接有氧化气体供给部31以及惰性气体供给部32。本实施方式中,由氧化气体供给部31供给O2(氧),由惰性气体供给部32供给N2。然而,作为氧化气体,例如,也可以供给一氧化二氮或臭氧等。另外,作为惰性气体,也可以供给氩气等。Themixer 30 is for generating a mixed gas of the metal raw material gas, the oxidizing gas, and the inert gas generated by thevaporizer 20 . Therefore, an oxidizing gas supply unit 31 and an inertgas supply unit 32 are connected to themixer 30 . In the present embodiment, O2 (oxygen) is supplied from the oxidizing gas supply unit 31 , and N 2 is supplied from the inertgas supply unit 32 . However, as the oxidizing gas, for example, dinitrogen monoxide, ozone, or the like may be supplied. In addition, argon gas or the like may be supplied as an inert gas.

成膜室50具有与供给管路33连接的腔室51,和腔室51内配置的平台52。腔室51的顶面设置有喷头53,该喷头53连接有供给管路33。平台52以及喷头53分别被配置在相对的位置。另外,腔室51内配置有未图示的洗净状态的如防粘板等零件。Thefilm forming chamber 50 has achamber 51 connected to the supply line 33 , and astage 52 disposed in thechamber 51 . Aspray head 53 is provided on the top surface of thechamber 51 , and the supply pipe 33 is connected to thespray head 53 . Theplatform 52 and theshower head 53 are respectively arranged at opposing positions. In addition, in thechamber 51, components such as a non-sticking release plate in a cleaned state are arranged.

如图1所示,在平台52上,载置有形成PZT薄膜的基板S。平台52具有例如加热器等的未图示的加热装置,能够加热载置的基板S。本实施方式中,作为平台52上载置的基板S,使用在形成100nm的SiO2氧化膜的8英寸的Si基板上以溅射法形成Ir为70nm的基板。然而,对基板的大小或材料等不进行限定。As shown in FIG. 1 , a substrate S on which a PZT thin film is formed is placed on astage 52 . Thestage 52 has a heating device (not shown), such as a heater, for example, and can heat the substrate S placed thereon. In the present embodiment, as the substrate S mounted on thestage 52, an 8-inch Si substrate formed with a 100 nm SiO2 oxide film by sputtering is used as the substrate S having an Ir of 70 nm. However, the size or material of the substrate is not limited.

腔室51通过压力调节阀门41连接到具备如干式泵或涡轮分子泵等的真空排气系统40。通过压力调节阀门41适当设定腔室51内的压力,能够容易地对应各种成膜压力条件。Thechamber 51 is connected to avacuum exhaust system 40 including a dry pump or a turbomolecular pump through apressure regulating valve 41 . By appropriately setting the pressure in thechamber 51 by thepressure regulating valve 41 , it is possible to easily cope with various film-forming pressure conditions.

包括从汽化器20到成膜室50的各管路、各阀门以及混合器30等的各装置由未图示的加热装置保持在例如200℃以上的高温状态,以便汽化的金属原料气体不会液化。Each device including each pipeline from thevaporizer 20 to thefilm forming chamber 50, each valve, and themixer 30 is kept at a high temperature of, for example, 200° C. or higher by a heating device not shown, so that the vaporized metal raw material gas will not be liquefied. .

本实施方式所涉及的薄膜制造装置100具有作为控制上述说明的各阀门或各装置的气体供给控制部的未图示的控制单元。控制单元具有如CPU(CentralProcessing Unit)或ROM(Read Only Memory)或者RAM(Random Access Memory)等组成的主存储器等。从控制部到各装置等,通过如有线或者无线输出控制信号,来控制薄膜制造装置100的操作。The thinfilm production apparatus 100 according to the present embodiment has a control unit (not shown) as a gas supply control unit that controls each valve and each device described above. The control unit has a main memory such as CPU (Central Processing Unit) or ROM (Read Only Memory) or RAM (Random Access Memory). The operation of the thinfilm manufacturing apparatus 100 is controlled by outputting control signals from the control unit to each device, for example, by wire or wirelessly.

[多室型(多腔室型)成膜装置][Multi-chamber (multi-chamber) film forming device]

图2是表示具有图1所示薄膜制造装置的多室型成膜装置的结构例的示意图。多室型成膜装置200具有,设置有能够输送基板S的未图示的输送机械手的输送室201、分别能够搭载1批25枚基板的2个储存室202。另外,多室型成膜装置200具有2个上述薄膜制造装置100,在输送室201的周围分别配置2个上述成膜室50。成膜室50以及储存室202,通过闸阀203分别连接到输送室201。需要说明的是,储存室202的个数不限于2个,也可以在输送室201的周围配置更多的或1个储存室。FIG. 2 is a schematic diagram showing a configuration example of a multi-chamber film forming apparatus including the thin film manufacturing apparatus shown in FIG. 1 . The multi-chamberfilm forming apparatus 200 has atransfer chamber 201 provided with a transfer robot (not shown) capable of transferring the substrate S, and twostorage chambers 202 each capable of loading a batch of 25 substrates. In addition, the multi-chamberfilm forming apparatus 200 includes the two thinfilm manufacturing apparatuses 100 described above, and the twofilm forming chambers 50 described above are respectively arranged around thetransfer chamber 201 . Thefilm forming chamber 50 and thestorage chamber 202 are respectively connected to thetransfer chamber 201 through thegate valve 203 . It should be noted that the number ofstorage chambers 202 is not limited to two, and more or one storage chamber may be arranged around thedelivery chamber 201 .

与分别将真空排气系统40连接到成膜室50同样,将真空排气系统204分别连接到输送室201以及储存室202。这样,各室能够独立地将内部抽空成真空气氛。然而,也可以例如并用1个真空排气系统,对输送室201、成膜室50以及储存室202的内部进行抽空。这种情况下,该真空排气系统具有图1所示的真空排气系统40的功能。Thevacuum exhaust system 204 is respectively connected to thetransfer chamber 201 and thestorage chamber 202 in the same manner as thevacuum exhaust system 40 is connected to thefilm forming chamber 50 . In this way, each chamber can independently evacuate the interior into a vacuum atmosphere. However, it is also possible to evacuate the inside of thetransport chamber 201 , thefilm formation chamber 50 , and thestorage chamber 202 , for example, by using one vacuum exhaust system in combination. In this case, the vacuum exhaust system has the function of thevacuum exhaust system 40 shown in FIG. 1 .

另外,输送室201连接有气体源205,由从该气体源205导入的惰性气体等调压气体,将输送室201内调节到规定的压力。输送室201的内部压力调节由设置在输送室201的未图示的自动压力调节阀门进行。In addition, a gas source 205 is connected to thetransfer chamber 201 , and the inside of thetransfer chamber 201 is adjusted to a predetermined pressure by a pressure regulating gas such as an inert gas introduced from the gas source 205 . The internal pressure of thetransfer chamber 201 is adjusted by an automatic pressure regulating valve (not shown) provided in thetransfer chamber 201 .

如图2所示,储存室202通过闸阀203连接到大气基板输送系统206。在大气基板输送系统206中,在多个晶片盒207和储存室202间设置有输送未成膜处理或者已经成膜处理的基板S的未图示的输送机械手。As shown in FIG. 2 , thestorage chamber 202 is connected to an atmosphericsubstrate delivery system 206 through agate valve 203 . In the atmosphericsubstrate transfer system 206 , a transfer robot (not shown) that transfers the substrates S that have not been film-formed or have been film-formed is provided between the plurality ofwafer cassettes 207 and thestorage chamber 202 .

成膜工序开始时,通过设置在空气基板输送系统206的输送机械手从放入25枚基板的晶片盒207将指定枚数的基板S输送到储存室202。搬入基板S的储存室202内抽空成真空。When the film forming process starts, a specified number of substrates S are transported to thestorage chamber 202 from thewafer cassette 207 containing 25 substrates by the transport robot installed in the airsubstrate transport system 206 . The inside of thestorage chamber 202 into which the substrate S is carried is evacuated to a vacuum.

打开位于抽空成真空的储存室202与输送室201之间的闸阀203,使输送室201以及储存室202都处于抽空成真空的状态。由气体源205向输送室201供给N2等调节气体例如1200sccm,调节输送室201的内部压力。Open thegate valve 203 between the evacuatedstorage chamber 202 and the conveyingchamber 201, so that the conveyingchamber 201 and the storingchamber 202 are both in a state of being evacuated into a vacuum. An adjustment gas such as N2 , for example, 1200 sccm is supplied to thetransfer chamber 201 from a gas source 205 to adjust the internal pressure of thetransfer chamber 201 .

本实施方式中,作为成膜压力条件,将成膜室50的内部压力设定为约2Torr。相应地,输送室201的内部压力调节成与成膜室50的内部压力大约相等的压力,或者比其高出5%左右的压力。需要说明的是,成膜室50内的内部压力,由图1所示的惰性气体供给部32所供给的N2进行调节。另外,可以适当设定上述的成膜压力条件。输送室201的压力调节几乎结束时,储存室202的第一枚基板S通过输送室201被送到成膜室50。In the present embodiment, the internal pressure of thefilm forming chamber 50 is set to about 2 Torr as the film forming pressure condition. Correspondingly, the internal pressure of thedelivery chamber 201 is adjusted to be approximately equal to the internal pressure of thefilm forming chamber 50 , or to be approximately 5% higher than the internal pressure. It should be noted that the internal pressure in thefilm forming chamber 50 is adjusted by N2 supplied from the inertgas supply unit 32 shown in FIG. 1 . In addition, the above-mentioned film-forming pressure conditions can be appropriately set. When the pressure adjustment of thetransfer chamber 201 is almost completed, the first substrate S in thestorage chamber 202 is sent to thefilm forming chamber 50 through thetransfer chamber 201 .

本实施方式所涉及的多室型成膜装置200中,由于配置了2个储存室202,所以若将基板S全部放入一个储存室202,则能够将基板S搭载到另一个储存室202。将基板S搭载到第二室的储存室202时,若搭载到第一室的储存室202的基板S的成膜过程结束,则将第二室的储存室202抽空成真空,再将基板S送到成膜室50。In the multi-chamberfilm forming apparatus 200 according to this embodiment, since twostorage chambers 202 are arranged, if all the substrates S are placed in onestorage chamber 202 , the substrate S can be loaded in theother storage chamber 202 . When loading the substrate S into thestorage chamber 202 of the second chamber, if the film-forming process of the substrate S loaded into thestorage chamber 202 of the first chamber is completed, thestorage chamber 202 of the second chamber is evacuated into a vacuum, and then the substrate S is sent to thefilm forming chamber 50.

[薄膜制造装置的操作][Operation of film manufacturing equipment]

从图1所示的He的供给管路11向各罐A~D供给He,则各罐A~D的内部压力上升,各罐A~D填充的有机金属的原料溶液以及溶剂被挤压出到载气(N2)的供给管路12。被挤压出的金属原料溶液以及溶剂的液滴的各自流量由液体流量控制器等控制,通过载气运送到汽化器20。When He is supplied to each tank A to D from theHe supply line 11 shown in FIG. To thesupply line 12 of the carrier gas (N2 ). The respective flow rates of the extruded metal raw material solution and solvent droplets are controlled by liquid flow controllers and the like, and are transported to thevaporizer 20 through the carrier gas.

汽化器20中,成膜工序开始时,通过由从罐D被挤压出的载气运送的溶剂开始汽化器20的喷嘴闪喷,约3分钟变成能够汽化金属原料溶液以及溶剂的状态。此时,打开通风管路22的阀门V2,溶剂的汽化气体以及载气被排弃到通风管路22。In thevaporizer 20, when the film forming process starts, the nozzle flash spray of thevaporizer 20 is started by the solvent carried by the carrier gas extruded from the tank D, and the metal raw material solution and the solvent can be vaporized in about 3 minutes. At this time, the valve V2 of theventilation line 22 is opened, and the vaporized gas of the solvent and the carrier gas are discharged to theventilation line 22 .

第1枚基板S被送到成膜室50载置在平台52上时,由设置在平台52的加热部对基板S进行加热。基板的温度在3分钟左右稳定在规定的温度内。本实施方式中,加热基板S使基板S的温度在600℃以上。所加热的基板S的温度可以适当的设定。When the first substrate S is sent to thefilm forming chamber 50 and placed on thestage 52 , the substrate S is heated by the heating unit provided on thestage 52 . The temperature of the substrate is stabilized within the specified temperature in about 3 minutes. In this embodiment, the substrate S is heated so that the temperature of the substrate S becomes 600° C. or higher. The temperature of the substrate S to be heated can be appropriately set.

在基板S的温度集中的2分钟前,汽化器20的汽化从溶剂的汽化切换到由成膜的流量控制的金属原料溶液主体的汽化(通风管路22保持打开状态)。Two minutes before the temperature concentration of the substrate S, the vaporization of thevaporizer 20 was switched from vaporization of the solvent to vaporization of the bulk of the metal raw material solution controlled by the flow rate of the film formation (theventilation line 22 was kept open).

成膜室50中的基板S或喷头53等零件的温度在规定的温度饱和时,则关闭通风管路22的阀门V2,打开运行管路21的阀门V1。并且由汽化器20汽化的金属原料溶液主体的汽化气体被供给到混合器30。When the temperature of parts such as the substrate S or thenozzle 53 in thefilm forming chamber 50 is saturated at a predetermined temperature, the valve V2 of theventilation line 22 is closed, and the valve V1 of theoperation line 21 is opened. And the vaporized gas of the metal raw material solution body vaporized by thevaporizer 20 is supplied to themixer 30 .

混合器30中以规定的混合比(摩尔比)混合汽化器20供给的汽化气体、作为氧化气体的O2以及作为惰性气体的N2。为了使例如成膜的PZT薄膜的结晶取向为预期的取向,适当地设定混合比。The vaporized gas supplied from thevaporizer 20 , O2 as an oxidizing gas, and N2 as an inert gas are mixed in themixer 30 at a predetermined mixing ratio (molar ratio). For example, the mixing ratio is appropriately set so that the crystal orientation of the formed PZT thin film becomes a desired orientation.

由混合器30生成的混合气体通过供给管路33供给到成膜室50的腔室51内。并且,向加热的基板S供给混合气体,将具有钙钛矿型结晶的PZT薄膜形成在基板S上。本实施方式中,以约15nm/min的成膜速率形成约70nm的PZT薄膜。因此,成膜所消耗的时间约300秒。然而,对成膜的PZT薄膜的厚度、成膜速率以及成膜所消耗的时间并不限于这些。The mixed gas generated by themixer 30 is supplied into thechamber 51 of thefilm forming chamber 50 through the supply line 33 . Then, a mixed gas is supplied to the heated substrate S to form a PZT thin film having a perovskite type crystal on the substrate S. As shown in FIG. In the present embodiment, a PZT thin film of about 70 nm is formed at a film formation rate of about 15 nm/min. Therefore, the time taken for film formation is about 300 seconds. However, the thickness of the PZT thin film to be formed, the rate of film formation, and the time taken for film formation are not limited to these.

成膜结束后,关闭运行管路21的阀门V1,打开通风管路22的阀门V2。因此,停止向腔室51内的基板S供给金属原料溶液的汽化气体,汽化气体被排弃到通风管路22。After the film formation is completed, the valve V1 of theoperation pipeline 21 is closed, and the valve V2 of theventilation pipeline 22 is opened. Therefore, the supply of the boil-off gas of the metal raw material solution to the substrate S in thechamber 51 is stopped, and the boil-off gas is discharged to thevent line 22 .

本实施方式中,停止向基板S供给金属原料气体后,限制连接到混合器30的氧化气体供给部31的O2的供给。对于这里所说的限制,本实施方式中是指停止向基板S供给O2。并且,从惰性气体供给部32供给规定量的N2,通过混合气体通过的供给管路33,将N2供给到腔室51内。此时的N2的量,可以维持在氧化气体供给部31的O2的供给停止前的流量,也可以在O2的供给停止后适当限制。或者,N2的量也可以设定成腔室51内的内部压力满足成膜压力条件的压力(约2Torr)。In the present embodiment, after the supply of the metal raw material gas to the substrate S is stopped, the supply of O2 to the oxidizing gas supply unit 31 connected to themixer 30 is limited. The limitation mentioned here means stopping supply of O2 to the substrate S in this embodiment. Then, a predetermined amount of N2 is supplied from the inertgas supply unit 32 , and N2 is supplied into thechamber 51 through the supply line 33 through which the mixed gas passes. The amount of N2 at this time may be maintained at the flow rate before the supply of O2 from the oxidizing gas supply unit 31 is stopped, or may be appropriately limited after the supply of O2 is stopped. Alternatively, the amount of N2 may be set so that the internal pressure in thechamber 51 satisfies the film-forming pressure condition (about 2 Torr).

停止向腔室51内供给金属原料溶液的汽化气体,从规定量的N2供给到腔室51内经过一定时间后,打开成膜室50以及输送室201之间的闸阀203,卸载成膜处理的基板S。本实施方式中,经过约60秒后,卸载基板S,但不限于此。例如,也可以经过30秒~120秒后卸载基板S。到基板S被卸载的时间,可基于如成膜处理的处理时间或基板的变质等可能性进行适当设定。Stop supplying the vaporized gas of the metal raw material solution into thechamber 51, and after a certain period of time has elapsed since a predetermined amount ofN2 is supplied into thechamber 51, open thegate valve 203 between thefilm forming chamber 50 and thetransfer chamber 201, and unload the film forming process. The substrate S. In the present embodiment, the substrate S is unloaded after about 60 seconds have elapsed, but the present invention is not limited thereto. For example, the substrate S may be unloaded after 30 seconds to 120 seconds have elapsed. The time until the substrate S is unloaded can be appropriately set based on possibilities such as the processing time of the film formation process and the deterioration of the substrate.

这样成膜后,因为供给N2后经过一定时间后卸载基板S,所以例如能够充分排出残留在成膜室50的混合气体后卸载基板S。因此,能够防止例如在卸载基板S时,残留的混合气体流入输送室201,可防止颗粒等产生。After film formation in this way, since the substrate S is unloaded after a certain time has elapsed after N2 is supplied, for example, the mixed gas remaining in thefilm formation chamber 50 can be fully exhausted and the substrate S can be unloaded. Therefore, for example, when the substrate S is unloaded, the remaining mixed gas can be prevented from flowing into thetransfer chamber 201 , and generation of particles and the like can be prevented.

图3是相对于供给给基板的Pb原料气体的流量比气体(Pb/(Zr+Ti)),表示制造的PZT薄膜中的Pb组成比例膜(Pb/(Zr+Ti))以及Zr组成比例膜(Zr/(Zr+Ti))的曲线图。Fig. 3 shows the Pb composition ratio film (Pb/(Zr+Ti)) and the Zr composition ratio in the produced PZT thin film relative to the flow ratio gas (Pb/(Zr+Ti)) of the Pb raw material gas supplied to the substrate Graph of film (Zr/(Zr+Ti)).

图3的曲线图中,图示了关于本实施方式中的薄膜制造装置100制造的PZT薄膜的曲线图和关于以比较例列举的薄膜制造方法制造的PZT薄膜的曲线图。本实施方式所涉及的PZT薄膜在成膜后,也就是说停止向成膜室50供给金属原料气体后,向腔室51内供给N2所制造的薄膜。另一方面,作为比较例列举的PZT薄膜在停止向成膜室50供给金属原料气体后,向腔室51内供给O2所制造的薄膜。3 shows a graph for the PZT thin film manufactured by the thinfilm manufacturing apparatus 100 in this embodiment and a graph for the PZT thin film manufactured by the thin film manufacturing method listed as a comparative example. The PZT thin film according to this embodiment is formed by supplying N2 into thechamber 51 after the film formation, that is, after the supply of the metal raw material gas to thefilm formation chamber 50 is stopped. On the other hand, the PZT thin film mentioned as a comparative example is a thin film produced by supplying O2 into thechamber 51 after stopping the supply of the metal raw material gas to thefilm forming chamber 50 .

在制造具有钙钛矿型结晶的电介质薄膜的PZT薄膜时,从Pb原料气体的流量少的一方,依次出现非晶区域、自对准区域以及PbO析出区域。非晶区域是Pb组成在化学计量比以下,得不到结晶性的PZT薄膜的区域,自对准区域是即使使Pb原料气体的流量变化,薄膜中的Pb组成比例的变化也很小的区域。PbO析出区域是PbO结晶析出,薄膜中的Pb组成急剧增加的区域。图3所示的曲线图中,图示了上述三个区域中的自对准区域内的测量结果。When a PZT thin film having a perovskite-type crystal dielectric thin film is produced, an amorphous region, a self-aligned region, and a PbO-deposited region appear in order from the flow rate of the Pb source gas. The amorphous region is a region where the Pb composition is below the stoichiometric ratio, and a crystalline PZT thin film cannot be obtained, and the self-aligned region is a region where the change in the Pb composition ratio in the thin film is small even if the flow rate of the Pb raw material gas is changed. . The PbO precipitation region is a region where PbO crystals precipitate and the Pb composition in the thin film increases rapidly. In the graph shown in FIG. 3 , the measurement results in the self-alignment region among the above-mentioned three regions are illustrated.

需要说明的是,图3中,Pb流量比的值为约1.15~1.5的区域作为自对准区域内的区域。然而,自对准区域基于例如成膜室50中的内部压力或温度等各成膜条件进行变动。因此,在制造PZT薄膜时,基于各成膜条件,适当设定自对准区域内所包含的Pb流量比。It should be noted that, in FIG. 3 , the region where the Pb flow rate ratio is about 1.15˜1.5 is defined as the region within the self-alignment region. However, the self-alignment region varies based on various film forming conditions such as internal pressure or temperature in thefilm forming chamber 50 . Therefore, when manufacturing the PZT thin film, the flow rate ratio of Pb contained in the self-alignment region is appropriately set based on each film forming condition.

如图3所示,所制造的PZT薄膜的Zr组成比例在本实施方式所涉及的PZT薄膜和比较例所涉及的PZT薄膜中几乎没有差别。也就是说,在成膜后供给到腔室51内的气体,可以是N2也可以是O2,PZT薄膜的Zr组成比例几乎看不出变化。需要说明的是,PZT薄膜的Zr组成比例,能够基于图1所示原料供给部10中的Zr流量比进行适当设定。Zr组成比例也可以设定成所制造PZT薄膜具有所期望的特性。As shown in FIG. 3 , there is almost no difference in the Zr composition ratio of the produced PZT thin film between the PZT thin film according to the present embodiment and the PZT thin film according to the comparative example. That is, the gas supplied to thechamber 51 after film formation may be N2 or O2 , and the Zr composition ratio of the PZT thin film hardly changes. It should be noted that the Zr composition ratio of the PZT thin film can be appropriately set based on the Zr flow rate ratio in the rawmaterial supply unit 10 shown in FIG. 1 . The composition ratio of Zr can also be set so that the produced PZT thin film has desired characteristics.

另一方面,从所制造的PZT薄膜的Pb组成比例来看,对比本实施方式所涉及的PZT薄膜,比较例所涉及的PZT薄膜的值大。也就是说,在成膜后所供给的气体是N2的本实施方式所涉及的制造方法,相比在成膜后供给O2的比较例的制造方法,能够抑制自对准区域中Pb组成的增加。On the other hand, in terms of the Pb composition ratio of the produced PZT thin film, the value of the PZT thin film according to the comparative example is larger than that of the PZT thin film according to the present embodiment. That is, the manufacturing method according to the present embodiment in which the gas supplied after film formation is N2 can suppress the composition of Pb in the self-alignment region compared to the production method of the comparative example in which O2 is supplied after film formation. increase.

通过自对准区域的机制,理想地得到PZT结晶,且未组成钙钛矿型结晶的多余的原子被排除。然而,实际上,多余的Pb原子会例如残留在PZT薄膜的晶界或表面。另外,也有Pb附着在腔室51内的零件等的情况。Through the mechanism of the self-aligned region, the PZT crystal is ideally obtained, and the redundant atoms that do not constitute the perovskite crystal are excluded. In practice, however, excess Pb atoms may remain, for example, on the grain boundaries or surfaces of the PZT thin film. In addition, Pb may adhere to components and the like in thechamber 51 .

考虑到这种状态下在成膜后供给O2时,例如PZT薄膜中残留的多余的Pb原子或从PZT薄膜挥发出的Pb原子与O2在加热到600℃以上的基板上结合容易生成PbO。另外,也要考虑到由附着在腔室51内的零件上的Pb挥发的气相中的Pb原子与O2相结合的情况。认为生成的PbO引入PZT薄膜的晶界或表面层,因此成为图3的曲线图所示的结果。Considering that whenO2 is supplied after film formation in this state, for example, excess Pb atoms remaining in the PZT thin film or Pb atoms volatilized from the PZT thin film combine withO2 to easily form PbO on the substrate heated to 600°C or higher. . In addition, it is also considered that Pb atoms in the gas phase volatilized from Pb adhering to components in thechamber 51 combine with O2 . It is considered that the generated PbO was incorporated into the grain boundaries or the surface layer of the PZT thin film, so that the results shown in the graph of FIG. 3 were obtained.

图4是表示本实施方式中的薄膜制造装置100所制造的PZT薄膜、比较例中的制造方法所制造的PZT薄膜的各表面层的相片,以及表面层的各测量值的图。图4(A)是本实施方式所涉及的PZT薄膜,图4(B)是比较例所涉及的PZT薄膜。各相片由原子力显微镜拍摄。4 is a graph showing photographs of each surface layer of the PZT thin film manufactured by the thinfilm manufacturing apparatus 100 of the present embodiment and the PZT thin film manufactured by the manufacturing method in the comparative example, and each measurement value of the surface layer. FIG. 4(A) is a PZT thin film according to this embodiment, and FIG. 4(B) is a PZT thin film according to a comparative example. Each photograph was taken by an atomic force microscope.

图4(A)以及(B)所示的各PZT薄膜是在Pb原料气体的流量比为1.15的情况下制造的薄膜。测量值Ra是平均表面粗糙度,测量值Rms是均方根粗糙度。测量值P-V是峰对谷。Each of the PZT thin films shown in FIGS. 4(A) and (B) was produced when the flow rate ratio of the Pb source gas was 1.15. The measured value Ra is the average surface roughness, and the measured value Rms is the root mean square roughness. Measurements P-V are peak-to-valley.

如这些测量值所示,可以得知本实施方式所涉及的薄膜制造装置100所制造的PZT薄膜与比较例所涉及的制造方法所制造的PZT薄膜相比,表面粗糙度要小。如上所述,本实施方式所涉及的薄膜制造方法中,能够防止未构成钙钛矿型结晶的多余的Pb原子在成膜后作为PbO引入PZT薄膜的表面层。因此,认为本实施方式所涉及的PZT薄膜的表面粗糙度较小。As shown by these measured values, it can be seen that the PZT thin film manufactured by the thinfilm manufacturing apparatus 100 according to this embodiment has a smaller surface roughness than the PZT thin film manufactured by the manufacturing method according to the comparative example. As described above, in the thin film manufacturing method according to this embodiment, it is possible to prevent excess Pb atoms not constituting perovskite crystals from being incorporated as PbO into the surface layer of the PZT thin film after film formation. Therefore, it is considered that the surface roughness of the PZT thin film according to this embodiment is small.

以上,本实施方式所涉及的薄膜制造装置100,以及通过该装置100进行的薄膜制造方法中,停止向基板S供给金属原料气体后,停止向基板S供给O2。因此,能够抑制成膜后未构成钙钛矿型结晶的多余的Pb原子与O2发生反应。因此,多余的Pb原子不会例如以氧化物PbO引入PZT薄膜的表面层,能够制造出表面粗糙度小的PZT薄膜。As described above, in the thinfilm manufacturing apparatus 100 according to this embodiment and the thin film manufacturing method performed by theapparatus 100 , after the supply of the metal raw material gas to the substrate S is stopped, the supply of O2 to the substrate S is stopped. Therefore, it is possible to suppress the reaction of excess Pb atoms that do not form perovskite crystals with O2 after film formation. Therefore, redundant Pb atoms are not introduced into the surface layer of the PZT thin film, for example, by oxide PbO, and a PZT thin film with a small surface roughness can be manufactured.

另外,本实施方式所涉及的薄膜制造方法中,根据成膜后停止供给O2,向腔室51内供给惰性气体N2,能够将例如腔室51内的内部压力调节到满足成膜压力条件的压力。因此,如在300枚左右的多个基板S上按顺序形成PZT薄膜时,能够有效地促进成膜过程。In addition, in the thin film manufacturing method according to this embodiment, by stopping the supply of O2 after film formation and supplying inert gas N2 into thechamber 51, for example, the internal pressure in thechamber 51 can be adjusted to satisfy the film formation pressure condition. pressure. Therefore, for example, when PZT thin films are sequentially formed on a plurality of substrates S of about 300 sheets, the film formation process can be effectively accelerated.

另外,如图1所示,本实施方式所涉及的薄膜制造方法中,混合器30连接有惰性气体供给部32,用于制造PZT薄膜的混合气体中包含作为惰性气体的N2。并且,该N2根据O2的供给停止供给到腔室51内。因此成膜后,不需要用于将惰性气体供给到腔室51内的新机构,能够在成膜后容易地供给惰性气体。In addition, as shown in FIG. 1 , in the thin film manufacturing method according to the present embodiment, themixer 30 is connected to an inertgas supply unit 32 , and the mixed gas for manufacturing the PZT thin film contains N2 as an inert gas. Then, the supply of N2 into thechamber 51 is stopped according to the supply of O2 . Therefore, a new mechanism for supplying the inert gas into thechamber 51 is not required after the film formation, and the inert gas can be easily supplied after the film formation.

进一步,本实施方式所涉及的薄膜制造方法中,通过连接混合器30和腔室51的供给管路33供给混合气体,成膜后通过混合气体通过的供给管路33供给N2。因此,金属原料气体的供给停止后,向腔室51内供给N2,以便挤压出包含金属原料气体的混合气体。因此,能够防止金属原料气体积聚在供给管路33中。此结果能够防止例如在成膜后的N2的供给中,供给管路中积聚的金属原料气体(混合气体)被供给到腔室51内,能够稳定的在基板S上形成PZT薄膜。Furthermore, in the thin film manufacturing method according to this embodiment, the mixed gas is supplied through the supply line 33 connecting themixer 30 and thechamber 51, and N2 is supplied through the supply line 33 through which the mixed gas passes after film formation. Therefore, after the supply of the metal raw material gas is stopped, N2 is supplied into thechamber 51 to squeeze out the mixed gas containing the metal raw material gas. Therefore, accumulation of the metal raw material gas in the supply line 33 can be prevented. As a result, it is possible to prevent, for example, the metal raw material gas (mixed gas) accumulated in the supply line from being supplied into thechamber 51 during the supply of N2 after film formation, and it is possible to stably form the PZT thin film on the substrate S.

本发明并不只限定于上述的实施方式,在不脱离本发明主旨的范围内可以进行各种变更。The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention.

例如,图5是表示图1所示的薄膜制造装置100的变形例的示意图。该薄膜制造装置300中,惰性气体供给部332没有连接到混合器330,而是单独连接到腔室351的喷头353。通过混合器330将金属原料气体和氧化气体进行混合,将其混合气体供给到基板S。因此,在基板S上形成PZT薄膜。成膜后,来自混合器330的混合气体(金属原料气体以及氧化气体)的供给停止,从惰性气体供给部332将惰性气体供给到腔室内。这样,惰性气体供给部332也可以连接到与混合器330不同的腔室351。For example, FIG. 5 is a schematic diagram showing a modified example of the thinfilm manufacturing apparatus 100 shown in FIG. 1 . In this thinfilm manufacturing apparatus 300 , the inertgas supply unit 332 is not connected to themixer 330 , but is connected to theshower head 353 of thechamber 351 alone. The metal raw material gas and the oxidizing gas are mixed by themixer 330 and the mixed gas is supplied to the substrate S. FIG. Accordingly, a PZT thin film is formed on the substrate S. As shown in FIG. After film formation, the supply of the mixed gas (metal source gas and oxidizing gas) from themixer 330 is stopped, and the inert gas is supplied into the chamber from the inertgas supply unit 332 . In this way, the inertgas supply unit 332 may also be connected to achamber 351 different from themixer 330 .

停止向基板供给金属原料气体后,也可以不进行惰性气体的供给。即使这种情况,如果在金属原料气体的供给停止后停止氧化气体的供给,也能够防止成膜后不需要的Pb原子和氧化气体反应,其氧化物PbO引入在PZT薄膜的表面层。成膜后不进行惰性气体的供给时,成膜后,成膜室内部一度处于打开的状态,在此状态下从输送室输送基板。After the supply of the metal raw material gas to the substrate is stopped, the supply of the inert gas may not be performed. Even in this case, if the supply of the oxidizing gas is stopped after the supply of the metal material gas is stopped, it is possible to prevent unnecessary Pb atoms from reacting with the oxidizing gas after film formation, and its oxide PbO is introduced into the surface layer of the PZT thin film. When the inert gas is not supplied after film formation, the inside of the film formation chamber is once opened after film formation, and the substrate is transported from the transport chamber in this state.

另外,也可以不设置混合器,金属原料气体、氧化气体供给部以及惰性气体供给部分别单独地连接到腔室。这种情况下,将会在腔室内生成金属原料气体、氧化气体以及惰性气体的混合气体。成膜后,像上述所说明的那样,能够控制氧化气体以及惰性气体的供给。In addition, the mixer may not be provided, and the metal raw material gas, the oxidizing gas supply unit, and the inert gas supply unit may be separately connected to the chamber. In this case, a mixed gas of metal raw material gas, oxidizing gas, and inert gas will be generated in the chamber. After film formation, the supply of the oxidizing gas and the inert gas can be controlled as described above.

上述实施方式中,停止向基板供给金属原料气体后,停止氧化气体的供给。然而,也可以在成膜后减少氧化气体的供给。也就是说,氧化气体的供给限制,可以包含氧化气体的供给停止和减少两个方面。通过成膜后减少氧化气体的供给,能够抑制成膜后的多余的Pb原子和氧化气体的反应。In the above-described embodiment, after the supply of the metal raw material gas to the substrate is stopped, the supply of the oxidizing gas is stopped. However, it is also possible to reduce the supply of the oxidizing gas after film formation. That is, the supply restriction of the oxidizing gas may include two aspects of stopping and reducing the supply of the oxidizing gas. By reducing the supply of the oxidizing gas after the film formation, the reaction between the excess Pb atoms after the film formation and the oxidizing gas can be suppressed.

上述实施方式中,由薄膜制造装置100制造PZT薄膜。然而,即使在制造作为具有钙钛矿型结晶的电介质薄膜的PZT薄膜以外的薄膜的情况下,本发明也能够适用。作为那样的电介质薄膜,例如,有锆钛酸铅镧((Pb,La)(Zr,Ti)O3,PLZT)或钽酸锶铋(SrBi2,Ta2,O9,SBT)等。In the above-described embodiment, the PZT thin film was manufactured by the thinfilm manufacturing apparatus 100 . However, the present invention is also applicable to the case of producing a thin film other than a PZT thin film which is a dielectric thin film having perovskite crystals. Examples of such dielectric thin films include lead lanthanum zirconate titanate ((Pb, La)(Zr, Ti)O3 , PLZT) and strontium bismuth tantalate (SrBi2 , Ta2 , O9 , SBT).

如图2所示,上述中作为包含本发明的实施方式所涉及的薄膜制造装置100的装置,示例出多室型成膜装置200。然而,也可以在例如具有蚀刻处理装置或洗净处理装置等的多个处理装置的基板处理装置上,设置本实施方式的薄膜制造装置100。作为这种基板处理装置,例如有集群式或连续式的基板处理装置。As shown in FIG. 2 , the multi-chamberfilm forming apparatus 200 was exemplified above as an apparatus including the thinfilm manufacturing apparatus 100 according to the embodiment of the present invention. However, for example, the thinfilm manufacturing apparatus 100 of this embodiment may be installed in a substrate processing apparatus including a plurality of processing apparatuses such as an etching processing apparatus or a cleaning processing apparatus. Such a substrate processing apparatus includes, for example, a cluster type or a continuous type substrate processing apparatus.

符号说明Symbol Description

S...基板S...Substrate

10...原料供给部10...Raw material supply department

11、12、33...供给管路11, 12, 33... supply lines

12...供给管路12...Supply line

20...汽化器20...Carburetor

21...运行管路21...Run pipeline

22...通风管路22...ventilation line

30、330...混合器30, 330... mixer

31...氧化气体供给部31...Oxidation gas supply unit

32、332...惰性气体供给部32, 332... Inert gas supply unit

51、351...腔室51, 351... chambers

100、300...薄膜制造装置。100, 300... Thin film manufacturing apparatus.

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